My family has 8mm home movie evidence of me approaching the TV as a 1-year-old and then turning its dials (it was 1976, after all) so that the TV just showed static instead of whatever show was on. It used to drive my sisters (and parents, I suspect) bonkers.
Tradition continues here in 2007. Our 1 year old Alex makes it part of his morning routine to wait until his older brother (3 year old Jacob) is all settled in at the breakfast table and watching PBS Kids, and then Alex waltzes over to the TV and turns it off. He then stands there as his elder sibling goes bonkers, screaming “Turn it on! Turn it on!” And I swear Alex gets this little, taunting smile of satisfaction at driving his brother crazy.